Reference no: EM13539174
9. A pet supplier has a stock of parakeets of which 30% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?
10. Why is the following distribution not a probability distribution?
x -5 -4 -3 -2 -1
P(x) 0.19 0.16 –0.10 0.48 0.27
11. On a Saturday evening, 34% of the people in Chicago go out to dinner, 18% see a movie, 13% have a party, and 35% stay home. Seventeen people are randomly selected. Can the probability that exactly 4 of them stay home be computed using a binomial model?
12. There are 50,000 people at a stadium watching a soccer match, and 40,000 of them are male. If 2 people are chosen at random, what is the probability that both of them are male?
13. What probability value would complete the following probability distribution?
x -3 -2 -1 0 1 2
P(x) 0.09 0.21 -0.02 p 0.17 0.25
14. A university has 10,000 students of which 6000 are male and 4000 are female. If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
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The distribution of all test scores is mostly likely to be
: The average length of crocodiles in a swamp is 12 feet. If the lengths are normally distributed with a standard deviation of 1.9, find the probability that a crocodile is more than 11.5 feet long.
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What is the z value such that 50% of the total area lies
: The mean weight of loads of rock is 43.0 tons with a standard deviation of 12.0 tons. If 9 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 38.60 tons. Assume that the variable is ..
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What is the mean and variance of the number of students
: A television station estimates that 50% of college students watch the Super Bowl. For a sample of 120 students selected at random, what is the mean and variance of the number of students who watch this game?
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What probability value would be needed to complete
: A researcher calculated the values and probabilities for a random variable X as shown below. Unfortunately, he erased the last value and needs to figure it out. If the mean of X was 2.2, then what was the last value?
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What is the chance that the pet store gets exactly one blue
: A pet supplier has a stock of parakeets of which 30% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?
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What is the mean and variance of the number of first grader
: A school is sending 11 children to a camp. If 20% of the children in the school are first graders, and the 8 children are selected at random, what is the mean and variance of the number of first graders chosen?
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What is the expected mean number of failures
: The probability of failure for taking the bar exam in Philadelphia is 41%. If 375 people take the bar exam, what is the expected mean number of failures?
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What are the critical chi square values
: 1.) A doctor claims that the standard deviation of systolic blood pressure is 12 mmHg. A random sample of 24 patients found a standard deviation of 14mmHg. Assume the variable is normally distributed. At a=0.01, what are the critical chi square..
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What is the probability that the two choose the same number
: A student and a professor each choose a number between 1 and 5 (1 and 5 are both possible choices). What is the probability that the two choose the same number?
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